1 files changed, 209 insertions, 84 deletions

diff --git a/drivers/net/ibmveth.c b/drivers/net/ibmveth.c
index 52d01027d9e7..4c2e7279ba34 100644
--- a/drivers/net/ibmveth.c
+++ b/drivers/net/ibmveth.c
@@ -24,7 +24,7 @@
 /* for use with IBM i/pSeries LPAR Linux.  It utilizes the logical LAN    */
 /* option of the RS/6000 Platform Architechture to interface with virtual */
 /* ethernet NICs that are presented to the partition by the hypervisor.   */
-/*                                                                        */ 
+/*                                                                        */
 /**************************************************************************/
 /*
   TODO:
@@ -61,7 +61,7 @@
 #undef DEBUG
 
 #define ibmveth_printk(fmt, args...) \
-  printk(KERN_INFO "%s: " fmt, __FILE__, ## args)
+  printk(KERN_DEBUG "%s: " fmt, __FILE__, ## args)
 
 #define ibmveth_error_printk(fmt, args...) \
   printk(KERN_ERR "(%s:%3.3d ua:%x) ERROR: " fmt, __FILE__, __LINE__ , adapter->vdev->unit_address, ## args)
@@ -79,7 +79,7 @@
 #else
 #define ibmveth_debug_printk_no_adapter(fmt, args...)
 #define ibmveth_debug_printk(fmt, args...)
-#define ibmveth_assert(expr) 
+#define ibmveth_assert(expr)
 #endif
 
 static int ibmveth_open(struct net_device *dev);
@@ -96,6 +96,7 @@ static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter);
 static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter);
 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance, struct pt_regs *regs);
 static inline void ibmveth_rxq_harvest_buffer(struct ibmveth_adapter *adapter);
+static struct kobj_type ktype_veth_pool;
 
 #ifdef CONFIG_PROC_FS
 #define IBMVETH_PROC_DIR "net/ibmveth"
@@ -133,12 +134,13 @@ static inline int ibmveth_rxq_frame_length(struct ibmveth_adapter *adapter)
 }
 
 /* setup the initial settings for a buffer pool */
-static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool, u32 pool_index, u32 pool_size, u32 buff_size)
+static void ibmveth_init_buffer_pool(struct ibmveth_buff_pool *pool, u32 pool_index, u32 pool_size, u32 buff_size, u32 pool_active)
 {
 	pool->size = pool_size;
 	pool->index = pool_index;
 	pool->buff_size = buff_size;
 	pool->threshold = pool_size / 2;
+	pool->active = pool_active;
 }
 
 /* allocate and setup an buffer pool - called during open */
@@ -146,13 +148,13 @@ static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
 {
 	int i;
 
-	pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL); 
+	pool->free_map = kmalloc(sizeof(u16) * pool->size, GFP_KERNEL);
 
 	if(!pool->free_map) {
 		return -1;
 	}
 
-	pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL); 
+	pool->dma_addr = kmalloc(sizeof(dma_addr_t) * pool->size, GFP_KERNEL);
 	if(!pool->dma_addr) {
 		kfree(pool->free_map);
 		pool->free_map = NULL;
@@ -180,7 +182,6 @@ static int ibmveth_alloc_buffer_pool(struct ibmveth_buff_pool *pool)
 	atomic_set(&pool->available, 0);
 	pool->producer_index = 0;
 	pool->consumer_index = 0;
-	pool->active = 0;
 
 	return 0;
 }
@@ -214,7 +215,7 @@ static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struc
 
 		free_index = pool->consumer_index++ % pool->size;
 		index = pool->free_map[free_index];
-	
+
 		ibmveth_assert(index != IBM_VETH_INVALID_MAP);
 		ibmveth_assert(pool->skbuff[index] == NULL);
 
@@ -231,10 +232,10 @@ static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struc
 		desc.desc = 0;
 		desc.fields.valid = 1;
 		desc.fields.length = pool->buff_size;
-		desc.fields.address = dma_addr; 
+		desc.fields.address = dma_addr;
 
 		lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
-		    
+
 		if(lpar_rc != H_SUCCESS) {
 			pool->free_map[free_index] = index;
 			pool->skbuff[index] = NULL;
@@ -250,13 +251,13 @@ static void ibmveth_replenish_buffer_pool(struct ibmveth_adapter *adapter, struc
 			adapter->replenish_add_buff_success++;
 		}
 	}
-    
+
 	mb();
 	atomic_add(buffers_added, &(pool->available));
 }
 
 /* replenish routine */
-static void ibmveth_replenish_task(struct ibmveth_adapter *adapter) 
+static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
 {
 	int i;
 
@@ -264,7 +265,7 @@ static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
 
 	for(i = 0; i < IbmVethNumBufferPools; i++)
 		if(adapter->rx_buff_pool[i].active)
-			ibmveth_replenish_buffer_pool(adapter, 
+			ibmveth_replenish_buffer_pool(adapter,
 						     &adapter->rx_buff_pool[i]);
 
 	adapter->rx_no_buffer = *(u64*)(((char*)adapter->buffer_list_addr) + 4096 - 8);
@@ -301,7 +302,6 @@ static void ibmveth_free_buffer_pool(struct ibmveth_adapter *adapter, struct ibm
 		kfree(pool->skbuff);
 		pool->skbuff = NULL;
 	}
-	pool->active = 0;
 }
 
 /* remove a buffer from a pool */
@@ -372,7 +372,7 @@ static void ibmveth_rxq_recycle_buffer(struct ibmveth_adapter *adapter)
 	desc.fields.address = adapter->rx_buff_pool[pool].dma_addr[index];
 
 	lpar_rc = h_add_logical_lan_buffer(adapter->vdev->unit_address, desc.desc);
-		    
+
 	if(lpar_rc != H_SUCCESS) {
 		ibmveth_debug_printk("h_add_logical_lan_buffer failed during recycle rc=%ld", lpar_rc);
 		ibmveth_remove_buffer_from_pool(adapter, adapter->rx_queue.queue_addr[adapter->rx_queue.index].correlator);
@@ -407,7 +407,7 @@ static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
 		}
 		free_page((unsigned long)adapter->buffer_list_addr);
 		adapter->buffer_list_addr = NULL;
-	} 
+	}
 
 	if(adapter->filter_list_addr != NULL) {
 		if(!dma_mapping_error(adapter->filter_list_dma)) {
@@ -433,7 +433,9 @@ static void ibmveth_cleanup(struct ibmveth_adapter *adapter)
 	}
 
 	for(i = 0; i<IbmVethNumBufferPools; i++)
-		ibmveth_free_buffer_pool(adapter, &adapter->rx_buff_pool[i]);
+		if (adapter->rx_buff_pool[i].active)
+			ibmveth_free_buffer_pool(adapter,
+						 &adapter->rx_buff_pool[i]);
 }
 
 static int ibmveth_open(struct net_device *netdev)
@@ -450,10 +452,10 @@ static int ibmveth_open(struct net_device *netdev)
 
 	for(i = 0; i<IbmVethNumBufferPools; i++)
 		rxq_entries += adapter->rx_buff_pool[i].size;
-    
+
 	adapter->buffer_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
 	adapter->filter_list_addr = (void*) get_zeroed_page(GFP_KERNEL);
- 
+
 	if(!adapter->buffer_list_addr || !adapter->filter_list_addr) {
 		ibmveth_error_printk("unable to allocate filter or buffer list pages\n");
 		ibmveth_cleanup(adapter);
@@ -489,9 +491,6 @@ static int ibmveth_open(struct net_device *netdev)
 	adapter->rx_queue.num_slots = rxq_entries;
 	adapter->rx_queue.toggle = 1;
 
-	/* call change_mtu to init the buffer pools based in initial mtu */
-	ibmveth_change_mtu(netdev, netdev->mtu);
-
 	memcpy(&mac_address, netdev->dev_addr, netdev->addr_len);
 	mac_address = mac_address >> 16;
 
@@ -504,7 +503,7 @@ static int ibmveth_open(struct net_device *netdev)
 	ibmveth_debug_printk("filter list @ 0x%p\n", adapter->filter_list_addr);
 	ibmveth_debug_printk("receive q   @ 0x%p\n", adapter->rx_queue.queue_addr);
 
-    
+
 	lpar_rc = h_register_logical_lan(adapter->vdev->unit_address,
 					 adapter->buffer_list_dma,
 					 rxq_desc.desc,
@@ -519,7 +518,18 @@ static int ibmveth_open(struct net_device *netdev)
 				     rxq_desc.desc,
 				     mac_address);
 		ibmveth_cleanup(adapter);
-		return -ENONET; 
+		return -ENONET;
+	}
+
+	for(i = 0; i<IbmVethNumBufferPools; i++) {
+		if(!adapter->rx_buff_pool[i].active)
+			continue;
+		if (ibmveth_alloc_buffer_pool(&adapter->rx_buff_pool[i])) {
+			ibmveth_error_printk("unable to alloc pool\n");
+			adapter->rx_buff_pool[i].active = 0;
+			ibmveth_cleanup(adapter);
+			return -ENOMEM ;
+		}
 	}
 
 	ibmveth_debug_printk("registering irq 0x%x\n", netdev->irq);
@@ -547,10 +557,11 @@ static int ibmveth_close(struct net_device *netdev)
 {
 	struct ibmveth_adapter *adapter = netdev->priv;
 	long lpar_rc;
-    
+
 	ibmveth_debug_printk("close starting\n");
 
-	netif_stop_queue(netdev);
+	if (!adapter->pool_config)
+		netif_stop_queue(netdev);
 
 	free_irq(netdev->irq, netdev);
 
@@ -694,7 +705,7 @@ static int ibmveth_start_xmit(struct sk_buff *skb, struct net_device *netdev)
 					     desc[5].desc,
 					     correlator);
 	} while ((lpar_rc == H_BUSY) && (retry_count--));
-    
+
 	if(lpar_rc != H_SUCCESS && lpar_rc != H_DROPPED) {
 		int i;
 		ibmveth_error_printk("tx: h_send_logical_lan failed with rc=%ld\n", lpar_rc);
@@ -780,7 +791,7 @@ static int ibmveth_poll(struct net_device *netdev, int *budget)
 		/* more work to do - return that we are not done yet */
 		netdev->quota -= frames_processed;
 		*budget -= frames_processed;
-		return 1; 
+		return 1;
 	}
 
 	/* we think we are done - reenable interrupts, then check once more to make sure we are done */
@@ -806,7 +817,7 @@ static int ibmveth_poll(struct net_device *netdev, int *budget)
 }
 
 static irqreturn_t ibmveth_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
-{   
+{
 	struct net_device *netdev = dev_instance;
 	struct ibmveth_adapter *adapter = netdev->priv;
 	unsigned long lpar_rc;
@@ -862,7 +873,7 @@ static void ibmveth_set_multicast_list(struct net_device *netdev)
 				ibmveth_error_printk("h_multicast_ctrl rc=%ld when adding an entry to the filter table\n", lpar_rc);
 			}
 		}
-	
+
 		/* re-enable filtering */
 		lpar_rc = h_multicast_ctrl(adapter->vdev->unit_address,
 					   IbmVethMcastEnableFiltering,
@@ -876,46 +887,22 @@ static void ibmveth_set_multicast_list(struct net_device *netdev)
 static int ibmveth_change_mtu(struct net_device *dev, int new_mtu)
 {
 	struct ibmveth_adapter *adapter = dev->priv;
+	int new_mtu_oh = new_mtu + IBMVETH_BUFF_OH;
 	int i;
-	int prev_smaller = 1;
 
-	if ((new_mtu < 68) || 
-	    (new_mtu > (pool_size[IbmVethNumBufferPools-1]) - IBMVETH_BUFF_OH))
+	if (new_mtu < IBMVETH_MAX_MTU)
 		return -EINVAL;
 
+	/* Look for an active buffer pool that can hold the new MTU */
 	for(i = 0; i<IbmVethNumBufferPools; i++) {
-		int activate = 0;
-		if (new_mtu > (pool_size[i]  - IBMVETH_BUFF_OH)) { 
-			activate = 1;
-			prev_smaller= 1;
-		} else {
-			if (prev_smaller)
-				activate = 1;
-			prev_smaller= 0;
+		if (!adapter->rx_buff_pool[i].active)
+			continue;
+		if (new_mtu_oh < adapter->rx_buff_pool[i].buff_size) {
+			dev->mtu = new_mtu;
+			return 0;
 		}
-
-		if (activate && !adapter->rx_buff_pool[i].active) {
-			struct ibmveth_buff_pool *pool = 
-						&adapter->rx_buff_pool[i];
-			if(ibmveth_alloc_buffer_pool(pool)) {
-				ibmveth_error_printk("unable to alloc pool\n");
-				return -ENOMEM;
-			}
-			adapter->rx_buff_pool[i].active = 1;
-		} else if (!activate && adapter->rx_buff_pool[i].active) {
-			adapter->rx_buff_pool[i].active = 0;
-			h_free_logical_lan_buffer(adapter->vdev->unit_address,
-					  (u64)pool_size[i]);
-		}
-
 	}
-
-	/* kick the interrupt handler so that the new buffer pools get
-	   replenished or deallocated */
-	ibmveth_interrupt(dev->irq, dev, NULL);
-
-	dev->mtu = new_mtu;
-	return 0;	
+	return -EINVAL;
 }
 
 static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_id *id)
@@ -928,7 +915,7 @@ static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_
 	unsigned int *mcastFilterSize_p;
 
 
-	ibmveth_debug_printk_no_adapter("entering ibmveth_probe for UA 0x%x\n", 
+	ibmveth_debug_printk_no_adapter("entering ibmveth_probe for UA 0x%x\n",
 					dev->unit_address);
 
 	mac_addr_p = (unsigned char *) vio_get_attribute(dev, VETH_MAC_ADDR, 0);
@@ -937,7 +924,7 @@ static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_
 				"attribute\n", __FILE__, __LINE__);
 		return 0;
 	}
-	
+
 	mcastFilterSize_p= (unsigned int *) vio_get_attribute(dev, VETH_MCAST_FILTER_SIZE, 0);
 	if(!mcastFilterSize_p) {
 		printk(KERN_ERR "(%s:%3.3d) ERROR: Can't find "
@@ -945,7 +932,7 @@ static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_
 				__FILE__, __LINE__);
 		return 0;
 	}
-	
+
 	netdev = alloc_etherdev(sizeof(struct ibmveth_adapter));
 
 	if(!netdev)
@@ -960,13 +947,14 @@ static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_
 	adapter->vdev = dev;
 	adapter->netdev = netdev;
 	adapter->mcastFilterSize= *mcastFilterSize_p;
-	
+	adapter->pool_config = 0;
+
 	/* 	Some older boxes running PHYP non-natively have an OF that
-		returns a 8-byte local-mac-address field (and the first 
+		returns a 8-byte local-mac-address field (and the first
 		2 bytes have to be ignored) while newer boxes' OF return
-		a 6-byte field. Note that IEEE 1275 specifies that 
+		a 6-byte field. Note that IEEE 1275 specifies that
 		local-mac-address must be a 6-byte field.
-		The RPA doc specifies that the first byte must be 10b, so 
+		The RPA doc specifies that the first byte must be 10b, so
 		we'll just look for it to solve this 8 vs. 6 byte field issue */
 
 	if ((*mac_addr_p & 0x3) != 0x02)
@@ -976,7 +964,7 @@ static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_
 	memcpy(&adapter->mac_addr, mac_addr_p, 6);
 
 	adapter->liobn = dev->iommu_table->it_index;
-	
+
 	netdev->irq = dev->irq;
 	netdev->open               = ibmveth_open;
 	netdev->poll               = ibmveth_poll;
@@ -989,14 +977,21 @@ static int __devinit ibmveth_probe(struct vio_dev *dev, const struct vio_device_
 	netdev->ethtool_ops           = &netdev_ethtool_ops;
 	netdev->change_mtu         = ibmveth_change_mtu;
 	SET_NETDEV_DEV(netdev, &dev->dev);
- 	netdev->features |= NETIF_F_LLTX; 
+ 	netdev->features |= NETIF_F_LLTX;
 	spin_lock_init(&adapter->stats_lock);
 
 	memcpy(&netdev->dev_addr, &adapter->mac_addr, netdev->addr_len);
 
-	for(i = 0; i<IbmVethNumBufferPools; i++)
-		ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i, 
-					 pool_count[i], pool_size[i]);
+	for(i = 0; i<IbmVethNumBufferPools; i++) {
+		struct kobject *kobj = &adapter->rx_buff_pool[i].kobj;
+		ibmveth_init_buffer_pool(&adapter->rx_buff_pool[i], i,
+					 pool_count[i], pool_size[i],
+					 pool_active[i]);
+		kobj->parent = &dev->dev.kobj;
+		sprintf(kobj->name, "pool%d", i);
+		kobj->ktype = &ktype_veth_pool;
+		kobject_register(kobj);
+	}
 
 	ibmveth_debug_printk("adapter @ 0x%p\n", adapter);
 
@@ -1025,6 +1020,10 @@ static int __devexit ibmveth_remove(struct vio_dev *dev)
 {
 	struct net_device *netdev = dev->dev.driver_data;
 	struct ibmveth_adapter *adapter = netdev->priv;
+	int i;
+
+	for(i = 0; i<IbmVethNumBufferPools; i++)
+		kobject_unregister(&adapter->rx_buff_pool[i].kobj);
 
 	unregister_netdev(netdev);
 
@@ -1048,7 +1047,7 @@ static void ibmveth_proc_unregister_driver(void)
 	remove_proc_entry(IBMVETH_PROC_DIR, NULL);
 }
 
-static void *ibmveth_seq_start(struct seq_file *seq, loff_t *pos) 
+static void *ibmveth_seq_start(struct seq_file *seq, loff_t *pos)
 {
 	if (*pos == 0) {
 		return (void *)1;
@@ -1063,18 +1062,18 @@ static void *ibmveth_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 	return NULL;
 }
 
-static void ibmveth_seq_stop(struct seq_file *seq, void *v) 
+static void ibmveth_seq_stop(struct seq_file *seq, void *v)
 {
 }
 
-static int ibmveth_seq_show(struct seq_file *seq, void *v) 
+static int ibmveth_seq_show(struct seq_file *seq, void *v)
 {
 	struct ibmveth_adapter *adapter = seq->private;
 	char *current_mac = ((char*) &adapter->netdev->dev_addr);
 	char *firmware_mac = ((char*) &adapter->mac_addr) ;
 
 	seq_printf(seq, "%s %s\n\n", ibmveth_driver_string, ibmveth_driver_version);
-	
+
 	seq_printf(seq, "Unit Address:    0x%x\n", adapter->vdev->unit_address);
 	seq_printf(seq, "LIOBN:           0x%lx\n", adapter->liobn);
 	seq_printf(seq, "Current MAC:     %02X:%02X:%02X:%02X:%02X:%02X\n",
@@ -1083,7 +1082,7 @@ static int ibmveth_seq_show(struct seq_file *seq, void *v)
 	seq_printf(seq, "Firmware MAC:    %02X:%02X:%02X:%02X:%02X:%02X\n",
 		   firmware_mac[0], firmware_mac[1], firmware_mac[2],
 		   firmware_mac[3], firmware_mac[4], firmware_mac[5]);
-	
+
 	seq_printf(seq, "\nAdapter Statistics:\n");
 	seq_printf(seq, "  TX:  skbuffs linearized:          %ld\n", adapter->tx_linearized);
 	seq_printf(seq, "       multi-descriptor sends:      %ld\n", adapter->tx_multidesc_send);
@@ -1095,7 +1094,7 @@ static int ibmveth_seq_show(struct seq_file *seq, void *v)
 	seq_printf(seq, "       add buffer failures:         %ld\n", adapter->replenish_add_buff_failure);
 	seq_printf(seq, "       invalid buffers:             %ld\n", adapter->rx_invalid_buffer);
 	seq_printf(seq, "       no buffers:                  %ld\n", adapter->rx_no_buffer);
-	
+
 	return 0;
 }
 static struct seq_operations ibmveth_seq_ops = {
@@ -1153,11 +1152,11 @@ static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter)
 }
 
 #else /* CONFIG_PROC_FS */
-static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter) 
+static void ibmveth_proc_register_adapter(struct ibmveth_adapter *adapter)
 {
 }
 
-static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter) 
+static void ibmveth_proc_unregister_adapter(struct ibmveth_adapter *adapter)
 {
 }
 static void ibmveth_proc_register_driver(void)
@@ -1169,6 +1168,132 @@ static void ibmveth_proc_unregister_driver(void)
 }
 #endif /* CONFIG_PROC_FS */
 
+static struct attribute veth_active_attr;
+static struct attribute veth_num_attr;
+static struct attribute veth_size_attr;
+
+static ssize_t veth_pool_show(struct kobject * kobj,
+                              struct attribute * attr, char * buf)
+{
+	struct ibmveth_buff_pool *pool = container_of(kobj,
+						      struct ibmveth_buff_pool,
+						      kobj);
+
+	if (attr == &veth_active_attr)
+		return sprintf(buf, "%d\n", pool->active);
+	else if (attr == &veth_num_attr)
+		return sprintf(buf, "%d\n", pool->size);
+	else if (attr == &veth_size_attr)
+		return sprintf(buf, "%d\n", pool->buff_size);
+	return 0;
+}
+
+static ssize_t veth_pool_store(struct kobject * kobj, struct attribute * attr,
+const char * buf, size_t count)
+{
+	struct ibmveth_buff_pool *pool = container_of(kobj,
+						      struct ibmveth_buff_pool,
+						      kobj);
+	struct net_device *netdev =
+	    container_of(kobj->parent, struct device, kobj)->driver_data;
+	struct ibmveth_adapter *adapter = netdev->priv;
+	long value = simple_strtol(buf, NULL, 10);
+	long rc;
+
+	if (attr == &veth_active_attr) {
+		if (value && !pool->active) {
+			if(ibmveth_alloc_buffer_pool(pool)) {
+                                ibmveth_error_printk("unable to alloc pool\n");
+                                return -ENOMEM;
+                        }
+			pool->active = 1;
+			adapter->pool_config = 1;
+			ibmveth_close(netdev);
+			adapter->pool_config = 0;
+			if ((rc = ibmveth_open(netdev)))
+				return rc;
+		} else if (!value && pool->active) {
+			int mtu = netdev->mtu + IBMVETH_BUFF_OH;
+			int i;
+			/* Make sure there is a buffer pool with buffers that
+			   can hold a packet of the size of the MTU */
+			for(i = 0; i<IbmVethNumBufferPools; i++) {
+				if (pool == &adapter->rx_buff_pool[i])
+					continue;
+				if (!adapter->rx_buff_pool[i].active)
+					continue;
+				if (mtu < adapter->rx_buff_pool[i].buff_size) {
+					pool->active = 0;
+					h_free_logical_lan_buffer(adapter->
+								  vdev->
+								  unit_address,
+								  pool->
+								  buff_size);
+				}
+			}
+			if (pool->active) {
+				ibmveth_error_printk("no active pool >= MTU\n");
+				return -EPERM;
+			}
+		}
+	} else if (attr == &veth_num_attr) {
+		if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT)
+			return -EINVAL;
+		else {
+			adapter->pool_config = 1;
+			ibmveth_close(netdev);
+			adapter->pool_config = 0;
+			pool->size = value;
+			if ((rc = ibmveth_open(netdev)))
+				return rc;
+		}
+	} else if (attr == &veth_size_attr) {
+		if (value <= IBMVETH_BUFF_OH || value > IBMVETH_MAX_BUF_SIZE)
+			return -EINVAL;
+		else {
+			adapter->pool_config = 1;
+			ibmveth_close(netdev);
+			adapter->pool_config = 0;
+			pool->buff_size = value;
+			if ((rc = ibmveth_open(netdev)))
+				return rc;
+		}
+	}
+
+	/* kick the interrupt handler to allocate/deallocate pools */
+	ibmveth_interrupt(netdev->irq, netdev, NULL);
+	return count;
+}
+
+
+#define ATTR(_name, _mode)      \
+        struct attribute veth_##_name##_attr = {               \
+        .name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE \
+        };
+
+static ATTR(active, 0644);
+static ATTR(num, 0644);
+static ATTR(size, 0644);
+
+static struct attribute * veth_pool_attrs[] = {
+	&veth_active_attr,
+	&veth_num_attr,
+	&veth_size_attr,
+	NULL,
+};
+
+static struct sysfs_ops veth_pool_ops = {
+	.show   = veth_pool_show,
+	.store  = veth_pool_store,
+};
+
+static struct kobj_type ktype_veth_pool = {
+	.release        = NULL,
+	.sysfs_ops      = &veth_pool_ops,
+	.default_attrs  = veth_pool_attrs,
+};
+
+
 static struct vio_device_id ibmveth_device_table[] __devinitdata= {
 	{ "network", "IBM,l-lan"},
 	{ "", "" }
@@ -1198,7 +1323,7 @@ static void __exit ibmveth_module_exit(void)
 {
 	vio_unregister_driver(&ibmveth_driver);
 	ibmveth_proc_unregister_driver();
-}	
+}
 
 module_init(ibmveth_module_init);
 module_exit(ibmveth_module_exit);